MAP is manifold "absolute" pressure,meaning read from perfect vaccuum=0psi
atmospheric is already 14.7 psi of your map sensor=1bar
14.7psi boost=atmo + 14.7=2 bar
29.4psi boost=atmo + 29.4=3 bar
u can get a 2.5bar,but thats not leaving u much headroom ontop of 20psi,so id just get the next size,but thats up to u.
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